JPS5917625Y2 - mold for molding - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a molding die having a so-called undercut on the inside of a molded product.

In a mold having an undercut, an oblique extrusion mechanism is generally employed to pull out the mold from the undercut when separating the mold.

However, if the undercut is deep, the mold is pulled out obliquely, so the mold inside the undercut may interfere with the molded product, and in severe cases, the molded product may be damaged.

In addition, oblique extrusion generally has a complicated mechanism and has the disadvantage that mold matching is difficult.

The present invention eliminates such drawbacks, and its purpose is to provide a molding die that prevents damage to the molded product by easily pulling the mold out of the deep undercut due to its simple mechanism. There is a particular thing.

The details of the present invention will be explained below with reference to FIGS. 1 to 5, which are one embodiment.

In the molded product 11 shown in FIGS. 1 and 2, a deep undercut portion 12 is formed in the center.

A mold 13 for manufacturing such a molded article is shown in FIG.

The movable mold 14 is fixed to the movable plate 15 and the fixed mold 16
The molded product 11 is molded inside a cavity 17 formed in both molds 14 and 16 facing each other.

A slide core 18 is inserted into the bottom cut portion 12,
The slide core 18 is prevented from moving vertically in the figure by a guide block 19 attached to a core 27 that is a part of the movable mold 14, but is allowed to move horizontally.

That is, as shown in FIG. 3, the guide block is tightened to the core 27 with bolts so as to sandwich the slide core 18 therebetween.

Further, an operating cylinder 20 is provided below the guide block 19.
Actuation block 22 attached to the tip of piston rod 21 of
The ridge surface 23 formed on the movable mold 14 (also shown in FIG. 4).

), and the operating block 22 has an inclined pin 2 that passes through the slide core 18.
4 is fixed.

Further, two pipes 25 and 26 are attached to the operating cylinder to arrange pressure fluid inside the cylinder.

Next, the operation of the present invention will be explained.

After moving the movable mold 14 forward by a mold clamping mechanism (not shown) and fixing it in the fixed mold 16, resin is injected into the cavity 17 by an injection molding machine (not shown) to mold the molded product 11 and cooled. Wait for it to solidify.

Pressure fluid is then sent from conduit 25 to operating cylinder 20 to lower piston rod 21 and operating block 22.

At this time, the inclined pin 24 also descends at the same time, so the slide core 18 moves to the left in the figure and is removed from the undercut 12.

If the movable mold 14 is moved back when the slide core 18 is pulled out from the uncut cut 12, the movable mold 14 is separated from the fixed mold 16, and the molded product 11 remains in the fixed mold 16.

FIG. 5 shows this state.

In the above description, the molding die 11 is left on the fixed molding die 16 side when the two molding molds 14 and 16 are separated, and is taken out from the fixed molding die 16.
If molds 14 and 16 are to remain, separate molds 14 and 16 and mold product 1.
The slide core 18 may be retreated before pushing out the slide core 18.

Further, the slide core 18 may be inserted into the undercut 12 at any point during the mold clamping operation.

As mentioned above, the molding die of the present invention uses a cylinder to slide the slide core inside the molding die and extracting it from the undercut before separating the molds, so that the molding die remains in the fixed mold when the molds are separated. Therefore, even if the undercut is deep inside the mold, the slide core can be pulled out without difficulty, and not only will the mold be not damaged, but it can be operated regardless of the opening of the mold.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partial front view of a molded metal, Fig. 2 is a sectional view taken along line 2-2 in Fig. 1, and Fig. 3 is a sectional view taken along the line 2-2 in Fig.
The figure is a partially cross-sectional side view of the molding die when the molds are assembled.
FIG. 4 is a front view, and FIG. 5 is a partially sectional side view when the mold is released.

Claims (1)

[Scope of utility model registration request] For molding consisting of a movable mold and a fixed mold in which a slide core inserted into the undercut portion slides on the core surface of the mold in order to mold a deep vIJ molded product having an undercut near the inner end. In the mold, a guide block movably guides the slide core in a direction toward and away from the undercut position, an inclined pin passing diagonally through the slide core, and a guide block to which the inclined pin is fixed, and the slide core an operating block movable in a direction substantially perpendicular to the direction of movement of the operating block, and an operating cylinder that moves the operating block toward and away from the slide core, and the operating cylinder moves the operating block into the sliding direction before mold separation. A molding die characterized in that the slide core is moved in a direction away from the core and is pulled out from the undercut as the inclined pin moves, thereby leaving the molded product in the fixed mold when the mold is separated.